<template>
  <div class="person">
    <h1>情况一：监视【ref】定义的【基本类型数据】</h1>
    <h2>当前求和为 {{ sum }}</h2>
    <button @click="changeSum">点我sum+1</button>
  </div>
</template>

<script lang="ts" setup name="Person">
import { ref, watch } from 'vue'
//数据
let sum = ref(0);
//方法
function changeSum() {
  sum.value += 1;
}
//监视，情况一：监视【ref】定义的【基本类型数据】
const stopWatch = watch(sum, (newValue, Oldvalue) => {
  console.log('sum变化了', newValue, Oldvalue);
  if (newValue >= 10) {
    stopWatch()
  }
})



</script>


<style scoped>
.person {
  background-color: skyblue;
  box-shadow: 0 0 10px;
  border-radius: 10px;
  padding: 20px;
}

button {
  margin: 0 5px;
}
</style>